Improvement in boiler-furnaces



initell gittata .gaat cima,

Letters Patent No.V 93,922, datedv August E17, 1869.

rMPRovnMnNT In BOILER-FURNACES.

The Schedulefi'eferred to, in these Letters Patenten@ making part of the same.

-appertains, to make and use the same, reference being had to the accompanying drawing', forming part of specification, in which-- Figure l is a central vertical longitudinal section.

Figure A2 is a transverse vertical section fin line. o'o, fig. 1.

Similar letters4 of reference indicate corresponding parts in -the two figures:

Y I My invention relates toa furnace for boilers, in which the gaseous products evolved from the burning fuel are thoroughly intermixed with atmospheric air, at Aa point where the intensity of the' heatinthe furnace shall insure aA perfect combustion of the gaseous pro-V ducts of. the fuel. v

lt consists in providing an opening or openings `in the bridge-wall, at 6r about the rear' of' thel furnace andthechamber behindthebridge-wall, which opening shall convey the products of combustion in the furnace 'to the chamber leading to tliesmoke-stack.

I surround this opening (partially or wholly) by iap-v other opening or openings, which'sball communicatev 'with the atniospheiicair outside of the furnace.

By these means is caused athorou'gh .concentrationl of theproducts of combustion at the opening or-openings through the bridgefwall, and an inteimixture therewith of a suitable proportion of atmospheric air, through the opening or openings which surround it, to perfect combustion',- Inthe A represents a boiler,

grate thereof, all of which may be of the ordinary form and construction'. f

D is the bridge-wall at the hack part of the furnace, and in ywhich is formed an opening oi.t rpenings, E, for the passage of the products of combustion.from the furnace to the passage-way to the smoke-stack.

B, the furnace, `and C, the' In the'pres'entcasethis'opening or openings com mence at a point beloryr the ,top' of the bridge-wall D, and gradually incline upward to its termination, so as to forni an oblique passage.

-Thisvop'ening may also extend horizontally through the bridge-wall D.

jG represents an airassage in the bridge-wall D, partially or wholly surlibunding the opening or open` ings E, and connecting. by a passage, F, with the at mosphere .outside the hrnace, said passage being prolvided* with the damperH, to control the admission of the air.

The operation isas follows: .A' fire being kindled, and a sutlicient degree of heat .being obtained,theprc'h1cts .ofcombustion aracarried,

toward the wall D, and, intermiiigling with the air from the passages (r and `l?, are concentrated at the opening E, thus causing a thoroughl inter-mixture of the products of combustion and the air, under an intense degree of heat, they being carried through the opening E, and directed against the bottom ofthev boiler, and

'again deflected into the chamber behind the bridge wall D, thus increasing the intermixture of the particles, and perfecting combustion.

llhe high degreeof heat that is maintained .at the point where the air is admitted, insures thorough com- -bnstion, thereby creating an intensey ame, and causing a saving in the .consumption of the fuel, and preventing t-he formation of smoke, as it is a welLknown principle in vchemistry that the hotter the products of combustion are, the greater will be their aiinit-y for the oxygen of the air.

Whatrl claim'as new, and desire to secure by Let- The opening E in the bridge-wall D,'in connection l Witnesses:

GEO, M. HorKINs, W.' I. MORGAN, J i-. 

